/Engine/Source/Runtime/Engine/Classes/Engine/StaticMesh.h
Returns vertex color data by position. For matching to reimported meshes that may have changed or copying vertex paint data from mesh to mesh.
void GetVertexColorData ( [TMap](API\Runtime\Core\Containers\TMap)< FVector3f, [FColor](API\Runtime\Core\Math\FColor) > & VertexColorData )